Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
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My Hobby Website:
Simple 1/4 wave 20dB Directional Coupler - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
Post subject: Simple 1/4 wave 20dB Directional Coupler
Unread postPosted: Tue Mar 22, 2005 7:48 pm
Joined: Tue Mar 22, 2005 7:16 pm
I finding myself
moving up in frequency to a design at 2.5-2.7GHz. It seems that this
frequency band is not a high-volume market area so most of the off-the-shelf
components are rated up to 2.5G.
My question is: does anyone
know of a manufacturer of surface mount Directional Couplers and Baluns
in my frequency range?
I've checked out Murata's Chip Multilayer
Hybrid Baluns and Couplers, but they fall short of my frequency requirements.
Max RF power is 1W.
Or, would it be easier just to design
my own simple 1/4 wave Directional Coupler to add to the board layout?
Unread postPosted: Wed
Mar 23, 2005 12:03 pm
My opinion is that it would be much easier
to design one yourself. I've had good success designing similar coupler
using Microwave Office.
Unread postPosted: Wed Mar 23, 2005 5:00 pm
They should have surface mount directional couplers at the required
frequency range and power
Unread postPosted: Sat Mar 26, 2005 9:19 am
very important point - the etching tolerances can play merry hell with
couplers, although 20dB should not present too great a problem, tighter
couplings are more sensitive.
In my experience, you rarely get
exactly what you designed :)
Don't use FR4 - it's too variable
to be any good for repeatability.